Which adjective does not necessarily describe a known feature of the early universe? (Be sure to consider the universe as a whole, not just the observable universe.)
A) filled with intense radiation B) hot
C) dense D) small
D
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Why do bridges have expansion joints?
a. They would buckle and crack otherwise. b. to let water run off c. to absorb vibrations due to traffic d. for ease in construction
CCDs are widely used in astronomy because the images are easily manipulated in computers, but photographic film is actually more sensitive to photons.
Answer the following statement true (T) or false (F)
The Sun will one day pass through the instability strip and become a variable star
a. True b. False Indicate whether the statement is true or false
Fluid Flow: An incompressible ideal fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4.0 cm?
A. 0.32 m/s B. 0.64 m/s C. 1.3 m/s D. 2.6 m/s E. 5.1 m/s